973-SF6 gas analyzer used for simultaneous measurement of humidity, SF₆ purity and SO₂ concentration. Pure SF₆ is the standard filling within GIS, but over time gas compartments become contaminated with water vapor (H₂O) through permeation and by desorption from internal materials. Whilst water vapor and SF₆ do not normally react with each other, in the presence of a high-energy discharge, hydrogen and oxygen disassociated from water vapor will react with the sulfur and fluorine from SF₆ to form decomposition by-products. These include sulfur dioxide (SO₂) and hydrofluoric acid (HF) that are corrosive to the internal components of gas compartments.

SF₆ with low water vapor content (low humidity) significantly reduces the potential for formation of these corrosive compounds, which is why accurate and repeatable measurement data is an invaluable part of any GIS preventative maintenance program.

The 973-SF6 gas analyzer is supplied as a complete set that includes:

• 973-SF₆ Instrument
• Transport Peli-Case 1620
• 6 m Stainless Steel armored PTFE tubing
• SF₆ coupling DN8 with quick coupling (Rectus)
• SF₆ coupling DN20 with quick coupling (Rectus)
• 90° Angle for Rectus-Coupling
• Serial cable DB9 3m 1:1 male/female
• RS-232 / USB Adapter
• USB stick with 973-SF₆ Software and operation manuals
• Power cable (country specific)
• Hex key for SO₂ module
• SO₂ Dummy sensor
• Cotton swabs, sterile (10 pieces)
• Operation Manual (2 pieces)
• Calibration Certificate

All accessories can also be ordered separately to replace damaged or missing components.